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  • Wazzzzzuuuppp ding dongers?

  • It's me Ding Sauce.

  • Today we're going to enjoy a little bit of MMM, Michael's Math Magic.

  • Thirteen years ago I discovered this pillowcase in a graveyard in Cincinnati and I could have

  • sworn it was smiling at me.

  • It was so weird.

  • I was likeWipe that grin off your face pillowcase.” and it was likeNo, how

  • about that?

  • I'm not going to do what you say because I am the Pillowcase of Terror.”

  • And I was likeokay that sounds pretty bad.

  • I'm gonna leave.”

  • and it was likeNo no no sorry it's just the name my parents gave me.

  • I'm actually pretty nice.

  • Really all I do is take that which is out of balance and I make it equal.”

  • And I was like okay yeah sure but if you say it that way it still sounds scary.

  • Anyway long story short we became friends but it is after all the Pillowcase of Terror

  • so I have to keep it locked up.

  • But if we're quiet enough we should be able to let it out.

  • Hannah could you make sure the door is locked.

  • Yeah.

  • Okay everyone hold your breath.

  • Don't let it know you're living until I have it in my hands.

  • Okay.

  • We're good?

  • Okay.

  • The Pillowcase of Terror.

  • Let me show you one of the things that it does.

  • It freaked me out when I learned it so here's a deck of card.

  • Nice bid ol' cards.

  • Boom.

  • Nice and big.

  • I'm gonna put these in the Pillowcase of Terror and I'm gonna meditate on my greatest

  • fear.

  • That which I wouldn't wish upon even my worst enemies.

  • Look at that.

  • Now the first time this happened to me I was likeThat is amazingand the pillowcase

  • was likeThese small cards were always inside me you just put the big ones in and

  • then you let go of them and you picked up the small ones.”

  • I was likeAhh you're right.”

  • Okay so that wasn't magic.

  • But today we're gonna do some real magic and this will defy reason so to protect us

  • I'm gonna be using my Greek philosopher playing cards.

  • You could really use any deck you want but this one makes me feel safe.

  • Now the power of the Pillowcase of Terror is a little bit frightening to me honestly.

  • But I think we might be able to outsmart it today.

  • Let's see.

  • Hannah what's your favorite number?

  • 6.

  • 6, okay.

  • 1, 2, 3, 4, 5, 6.

  • And uhh Jack what's your favorite number?

  • 5.

  • 5?

  • Okay.

  • 1, 2, 3, 4, 5.

  • 6+5 is 11 so we have an odd number of cards here.

  • That's good.

  • I like that.

  • Here's how we're gonna test the pillowcase.

  • I'm gonna take the 11 cards and turn them face up so now we have 11 face-up cards.

  • Easy, great, perfect.

  • Now I'm gonna shuffle these face-up cards into the rest of the cards which are face-down.

  • Perfect.

  • Okay.

  • Push them together.

  • Let's give them a few little moves like this.

  • I'll do a little riffle and then a little cascadey-dude.

  • Beautiful.

  • Great.

  • Okay so we now have a shuffled deck of a card, 11 of which are face-up.

  • And there those face-up cards are sort of randomly distributed throughout the deck.

  • What I'm gonna do now is take this deck of cards and I'm going to put it in my hands

  • inside the pillowcase of terror.

  • It won't be pretty but when I am done, and the pillowcase is done and I take my hands

  • out I will be holding out two piles of cards.

  • They may not have the same number in them, I don't know but what I do know is that

  • the number of face-up cards in both piles will be equal.

  • Ready?

  • Ohhh!

  • Okay they're getting really hot!

  • Okay!

  • It's done!

  • It's happened.

  • I now have two piles of cards.

  • They're not of equal size but they should have the same number of face-up cards each.

  • Let's see if the case has done its work.

  • Okay.

  • In this pile we have 1, 2, 3, 4, 5, 6, 7 face-up cards.

  • In this pile we have 1, 2, 3, 4, 5, 6, 7 face-up cards.

  • 7 face-up cards in both piles.

  • That's why they call it the Pillowcase of Terror.

  • Okay so how does this trick work?

  • Well believe it or not this is just a regular old pillowcase.

  • There's nothing special about it.

  • Fooled you right?

  • You don't need to be scared of it and it has no magical powers.

  • This trick is self-working.

  • It's math magic.

  • As long as you follow the right procedure you will always get the result that you want.

  • All you have to do is count out some number of cards.

  • Let's say seventeen.

  • 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17.

  • Now I'm gonna flip these cards over and they're now face-up.

  • When I shuffle them into the deck it really does not matter where they go.

  • You could even have a friend do this.

  • You could have some member of your audience do this.

  • We really just wanna mix them all around.

  • And there's no trick involved into where they go.

  • We just wanna have those 17 face-up cards in the deck somewhere.

  • Doesn't matter where they are.

  • Then you take seventeen cards out of the deck.

  • Doesn't matter from where but it's easiest to take them right off the top.

  • 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17.

  • Now what I do is I take the 17 I took off the top and I flip them over and boom both

  • piles now have the exact same number of face-up cards every time.

  • For real let's take a look.

  • This pile has 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 and this pile will also have 12.

  • Watch.

  • 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12.

  • How does this work?

  • It's actually quite simple.

  • When I take some cards out of the deck.

  • Let's say 24 in this case.

  • Here's 24 cards.

  • I take out 24 cards and I turn them over.

  • I now have 24 face-up cards.

  • I shuffle them into the deck.

  • There are 24 face-up cards in the deck.

  • Could be any number of cards though.

  • There we go.

  • 24 cards are now face-up in this deck.

  • I then remove that number of cards from the deck from the top for example.

  • 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24.

  • Perfect.

  • Now what do we know.

  • We know that there are a total of 24 face-up cards all together.

  • We also know there are 24 cards here.

  • So how many face-up cards are here?

  • We'll call this Pile A. And we'll call this one pile B. In pile A, how many cards

  • are face up?

  • I don't know!

  • I shuffled them.

  • It's all kind of random.

  • I didn't pay attention to where I put them.

  • Let's just call that number X. Okay.

  • So in this piles of 24 cards, x of them are face-up.

  • So how many are face-down?

  • Just 24-X.

  • Now how many cards in this pile are face-up?

  • Well, we know that there's 24 face-up cards total.

  • And x of them are in here.

  • So the number of face-up cards in this pile, Pile B, is 24 minus the x that are in here

  • so we have 24-x face-up cards here and we have 24-x face-down cards here.

  • When I turn one of the piles over.

  • Doesn't actually matter which one every face-up card becomes the opposite, face-down.

  • And every face-down card becomes faced-up so we have the same number of face-down cards

  • in A as we did face-up cards in B. I just changed all of those face-down cards to face-up

  • cards so now we have the same number of face-up cards in both piles.

  • Interestingly you can choose to reverse either half so long as you don't reverse both of

  • them and that is the trick of the Pillowcase of Terror.

  • Also known as cards in the dark.

  • Missmag himself didn't even give it a name.

  • He just did it and it's amazing.

  • But I love the trick and it's really fun to use these sort of concepts and mathematical

  • principles to develop your own magic.

  • So have fun, keep your pillowcases locked up, and as always, thanks for watching.

Wazzzzzuuuppp ding dongers?

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恐怖的枕頭套|數學魔法 (The Pillowcase of Terror | Math Magic)

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    林宜悉 發佈於 2021 年 01 月 14 日